From 01379c5e3cd1181c7c7d37a672364fbcad627fb0 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 25 Jul 2021 22:20:56 -0300
Subject: shader/rescaling_pass: Patch more instructions

---
 src/shader_recompiler/ir_opt/rescaling_pass.cpp | 105 +++++++++++++++++++++++-
 1 file changed, 101 insertions(+), 4 deletions(-)

diff --git a/src/shader_recompiler/ir_opt/rescaling_pass.cpp b/src/shader_recompiler/ir_opt/rescaling_pass.cpp
index f8d04b6e3..d5b98ae6e 100644
--- a/src/shader_recompiler/ir_opt/rescaling_pass.cpp
+++ b/src/shader_recompiler/ir_opt/rescaling_pass.cpp
@@ -22,6 +22,105 @@ void PatchFragCoord(IR::Block& block, IR::Inst& inst) {
     inst.ReplaceUsesWith(downscaled_frag_coord);
 }
 
+[[nodiscard]] IR::U32 Scale(IR::IREmitter& ir, const IR::U1& is_scaled, const IR::U32& value) {
+    IR::U32 scaled_value{value};
+    bool changed{};
+    if (const u32 up_scale = Settings::values.resolution_info.up_scale; up_scale != 1) {
+        scaled_value = ir.IMul(value, ir.Imm32(up_scale));
+        changed = true;
+    }
+    if (const u32 down_shift = Settings::values.resolution_info.down_shift; down_shift != 0) {
+        scaled_value = ir.ShiftRightArithmetic(value, ir.Imm32(down_shift));
+        changed = true;
+    }
+    if (changed) {
+        return IR::U32{ir.Select(is_scaled, scaled_value, value)};
+    } else {
+        return value;
+    }
+}
+
+[[nodiscard]] IR::U32 DownScale(IR::IREmitter& ir, IR::U32 value) {
+    if (const u32 down_shift = Settings::values.resolution_info.down_shift; down_shift != 0) {
+        value = ir.ShiftLeftLogical(value, ir.Imm32(down_shift));
+    }
+    if (const u32 up_scale = Settings::values.resolution_info.up_scale; up_scale != 1) {
+        value = ir.IDiv(value, ir.Imm32(up_scale));
+    }
+    return value;
+}
+
+void PatchImageQueryDimensions(IR::Block& block, IR::Inst& inst) {
+    const auto it{IR::Block::InstructionList::s_iterator_to(inst)};
+    IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
+    const auto info{inst.Flags<IR::TextureInstInfo>()};
+    switch (info.type) {
+    case TextureType::Color1D:
+    case TextureType::ColorArray1D: {
+        const IR::Value new_inst{&*block.PrependNewInst(it, inst)};
+        const IR::U32 width{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 0)})};
+        const IR::Value replacement{ir.CompositeConstruct(width, ir.CompositeExtract(new_inst, 1),
+                                                          ir.CompositeExtract(new_inst, 2),
+                                                          ir.CompositeExtract(new_inst, 3))};
+        inst.ReplaceUsesWith(replacement);
+        break;
+    }
+    case TextureType::Color2D:
+    case TextureType::ColorArray2D: {
+        const IR::Value new_inst{&*block.PrependNewInst(it, inst)};
+        const IR::U32 width{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 0)})};
+        const IR::U32 height{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 1)})};
+        const IR::Value replacement{ir.CompositeConstruct(
+            width, height, ir.CompositeExtract(new_inst, 2), ir.CompositeExtract(new_inst, 3))};
+        inst.ReplaceUsesWith(replacement);
+        break;
+    }
+    case TextureType::Color3D:
+    case TextureType::ColorCube:
+    case TextureType::ColorArrayCube:
+    case TextureType::Buffer:
+        // Nothing to patch here
+        break;
+    }
+}
+
+void PatchImageFetch(IR::Block& block, IR::Inst& inst) {
+    IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
+    const auto info{inst.Flags<IR::TextureInstInfo>()};
+    const IR::U1 is_scaled{ir.IsTextureScaled(ir.Imm32(info.descriptor_index))};
+    const IR::Value coord{inst.Arg(1)};
+    switch (info.type) {
+    case TextureType::Color1D:
+        inst.SetArg(1, Scale(ir, is_scaled, IR::U32{coord}));
+        break;
+    case TextureType::ColorArray1D: {
+        const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
+        const IR::U32 y{ir.CompositeExtract(coord, 1)};
+        inst.SetArg(1, ir.CompositeConstruct(x, y));
+        break;
+    }
+    case TextureType::Color2D: {
+        const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
+        const IR::U32 y{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 1)})};
+        inst.SetArg(1, ir.CompositeConstruct(x, y));
+        break;
+    }
+    case TextureType::ColorArray2D: {
+        const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
+        const IR::U32 y{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 1)})};
+        const IR::U32 z{ir.CompositeExtract(coord, 2)};
+        inst.SetArg(1, ir.CompositeConstruct(x, y, z));
+        break;
+    }
+    case TextureType::Color3D:
+    case TextureType::ColorCube:
+    case TextureType::ColorArrayCube:
+    case TextureType::Buffer:
+        // Nothing to patch here
+        break;
+    }
+}
+
 void Visit(const IR::Program& program, IR::Block& block, IR::Inst& inst) {
     const bool is_fragment_shader{program.stage == Stage::Fragment};
     switch (inst.GetOpcode()) {
@@ -40,12 +139,10 @@ void Visit(const IR::Program& program, IR::Block& block, IR::Inst& inst) {
         break;
     }
     case IR::Opcode::ImageQueryDimensions:
+        PatchImageQueryDimensions(block, inst);
         break;
     case IR::Opcode::ImageFetch:
-        break;
-    case IR::Opcode::ImageRead:
-        break;
-    case IR::Opcode::ImageWrite:
+        PatchImageFetch(block, inst);
         break;
     default:
         break;
-- 
cgit v1.2.3